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P1E4B Cadillac Code - Control Module Redundant Drive Motor 2 Speed Sensing Circuit

Quick Answer

The drive motor generator position sensor is monitored by the motor control module. Common causes include Program Power Inverter Module, Faulty Power Inverter Module, Power Inverter Module harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1E4B Cadillac indicates Control Module Redundant Drive Motor 2 Speed Sensing Circuit.
Common causes: Common causes include Program Power Inverter Module, Faulty Power Inverter Module, Power Inverter Module harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 878

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Apr 23, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1E4B Cadillac Description

The drive motor generator position sensor is monitored by the motor control module. The motor control module monitors the angular position, speed and direction of the drive motor generator based upon the signals of the resolver-type position sensor. The position sensor allows the motor control module to determine the exact position, speed and direction of the drive motor generator. The hybrid powertrain control module also calculates motor speed. This fault is handled inside the power inverter module, often referred to as the drive motor generator power inverter module, and no external circuits are involved.

OBDII Code P1E4B Cadillac - Control Module Redundant Drive Motor 2 Speed Sensing Circuit - AutoCodes.com — P1E4B Cadillac Code - Control Module Redundant Drive Motor 2 Speed Sensing Circuit

What does this mean?

What are the Possible Causes of the DTC P1E4B Cadillac?

Program Power Inverter Module
Faulty Power Inverter Module
Power Inverter Module harness is open or shorted
Power Inverter Module circuit poor electrical connection

How to Fix the DTC P1E4B Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1E4B Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1E4B Cadillac Code

What does the OBDII code P1E4B mean on a Cadillac?

The P1E4B code indicates an issue with the Control Module Redundant Drive Motor 2 Speed Sensing Circuit, which monitors the speed of a secondary motor in hybrid or electric vehicles.

What are the common symptoms of the P1E4B code on a Cadillac?

Common symptoms include an illuminated check engine light, reduced vehicle performance, possible loss of hybrid or electric drive functionality, and unusual motor behavior.

What causes the P1E4B code to appear?

Possible causes include a faulty speed sensor, damaged wiring or connectors in the circuit, a malfunctioning drive motor control module, or software issues.

Can I drive my Cadillac with a P1E4B code?

It is not recommended to drive with this code active, as it can affect vehicle performance and safety, especially in hybrid or electric systems.

How do I diagnose the P1E4B code on my Cadillac?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the speed sensor and associated wiring for damage, and testing the drive motor control module.

What tools are needed to fix the P1E4B code?

You may need an OBDII scanner, a multimeter for electrical testing, and possibly tools for removing and replacing the speed sensor or repairing wiring.

How much does it cost to repair the P1E4B code on a Cadillac?

Repair costs can vary but typically range from $150 to $500, depending on whether the issue is with the sensor, wiring, or control module.

Can a software update fix the P1E4B code on a Cadillac?

In some cases, a software update may resolve the issue if the problem is related to a programming error in the control module.

What should I check first to fix the P1E4B code?

Start by inspecting the wiring and connectors associated with the drive motor speed sensor circuit for damage, corrosion, or loose connections.

Do I need to replace the drive motor to resolve the P1E4B code?

Not necessarily. The issue is often with the speed sensor, wiring, or control module rather than the entire drive motor itself. Proper diagnosis is essential.